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  <title>Adjusts the result pointer to an arbitrary row in the result</title>
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  <div id="layout-content"><div id="mysqli-result.data-seek" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">mysqli_result::data_seek</h1>
  <h1 class="refname">mysqli_data_seek</h1>
  <p class="verinfo">(PHP 5, PHP 7, PHP 8)</p><p class="refpurpose"><span class="refname">mysqli_result::data_seek</span> -- <span class="refname">mysqli_data_seek</span> &mdash; <span class="dc-title">Adjusts the result pointer to an arbitrary row in the result</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-mysqli-result.data-seek-description">
  <h3 class="title">说明</h3>
  <p class="para">面向对象风格</p>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="methodname"><strong>mysqli_result::data_seek</strong></span>(<span class="methodparam"><span class="type">int</span> <code class="parameter">$offset</code></span>): <span class="type">bool</span></div>

  <p class="para rdfs-comment">过程化风格</p>
  <div class="methodsynopsis dc-description"><span class="methodname"><strong>mysqli_data_seek</strong></span>(<span class="methodparam"><span class="type"><a href="class.mysqli-result.html" class="type mysqli_result">mysqli_result</a></span> <code class="parameter">$result</code></span>, <span class="methodparam"><span class="type">int</span> <code class="parameter">$offset</code></span>): <span class="type">bool</span></div>

  <p class="para rdfs-comment">
   The <span class="function"><strong>mysqli_data_seek()</strong></span> function seeks to an arbitrary
   result pointer specified by the <code class="parameter">offset</code> in the
   result set.
  </p>
 </div>

 
 <div class="refsect1 parameters" id="refsect1-mysqli-result.data-seek-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>
    <dt>

<code class="parameter">result</code></dt>
<dd>
<p class="para">仅以过程化样式：由
<span class="function"><a href="mysqli.query.html" class="function">mysqli_query()</a></span>、<span class="function"><a href="mysqli.store-result.html" class="function">mysqli_store_result()</a></span>、
<span class="function"><a href="mysqli.use-result.html" class="function">mysqli_use_result()</a></span>、<span class="function"><a href="mysqli-stmt.get-result.html" class="function">mysqli_stmt_get_result()</a></span> 返回的 <span class="classname"><a href="class.mysqli-result.html" class="classname">mysqli_result</a></span> 对象。</p></dd>

    
     <dt>
<code class="parameter">offset</code></dt>

     <dd>

      <p class="para">
       The row offset. Must be between zero and the total number of rows
       minus one (0..<span class="function"><a href="mysqli-result.num-rows.html" class="function">mysqli_num_rows()</a></span> - 1).
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-mysqli-result.data-seek-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   成功时返回 <strong><code>true</code></strong>， 或者在失败时返回 <strong><code>false</code></strong>。
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-mysqli-result.data-seek-examples">
  <h3 class="title">范例</h3>
  <div class="example" id="example-1518">
   <p><strong>示例 #1 <span class="methodname"><strong>mysqli::data_seek()</strong></span> example</strong></p>
   <div class="example-contents"><p>面向对象风格</p></div>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br />mysqli_report</span><span style="color: #007700">(</span><span style="color: #0000BB">MYSQLI_REPORT_ERROR&nbsp;</span><span style="color: #007700">|&nbsp;</span><span style="color: #0000BB">MYSQLI_REPORT_STRICT</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$mysqli&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">mysqli</span><span style="color: #007700">(</span><span style="color: #DD0000">"localhost"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"my_user"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"my_password"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"world"</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$query&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">"SELECT&nbsp;Name,&nbsp;CountryCode&nbsp;FROM&nbsp;City&nbsp;ORDER&nbsp;BY&nbsp;Name"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$result&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$mysqli</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">query</span><span style="color: #007700">(</span><span style="color: #0000BB">$query</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/*&nbsp;Seek&nbsp;to&nbsp;row&nbsp;no.&nbsp;401&nbsp;*/<br /></span><span style="color: #0000BB">$result</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">data_seek</span><span style="color: #007700">(</span><span style="color: #0000BB">400</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/*&nbsp;Fetch&nbsp;single&nbsp;row&nbsp;*/<br /></span><span style="color: #0000BB">$row&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$result</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">fetch_row</span><span style="color: #007700">();<br /><br /></span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"City:&nbsp;%s&nbsp;&nbsp;Countrycode:&nbsp;%s\n"</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">],&nbsp;</span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #0000BB">1</span><span style="color: #007700">]);</span>
</span>
</code></div>
   </div>

   <div class="example-contents"><p>过程化风格</p></div>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br />mysqli_report</span><span style="color: #007700">(</span><span style="color: #0000BB">MYSQLI_REPORT_ERROR&nbsp;</span><span style="color: #007700">|&nbsp;</span><span style="color: #0000BB">MYSQLI_REPORT_STRICT</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$link&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">mysqli_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">"localhost"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"my_user"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"my_password"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"world"</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$query&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">"SELECT&nbsp;Name,&nbsp;CountryCode&nbsp;FROM&nbsp;City&nbsp;ORDER&nbsp;BY&nbsp;Name"</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">$result&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">mysqli_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$query</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/*&nbsp;Seek&nbsp;to&nbsp;row&nbsp;no.&nbsp;401&nbsp;*/<br /></span><span style="color: #0000BB">mysqli_data_seek</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">400</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/*&nbsp;Fetch&nbsp;single&nbsp;row&nbsp;*/<br /></span><span style="color: #0000BB">$row&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">mysqli_fetch_row</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">printf&nbsp;</span><span style="color: #007700">(</span><span style="color: #DD0000">"City:&nbsp;%s&nbsp;&nbsp;Countrycode:&nbsp;%s\n"</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">],&nbsp;</span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #0000BB">1</span><span style="color: #007700">]);</span>
</span>
</code></div>
   </div>

   <div class="example-contents"><p>以上例程会输出：</p></div>
   <div class="example-contents screen">
<div class="cdata"><pre>
City: Benin City  Countrycode: NGA
</pre></div>
   </div>
  </div>

  <div class="example" id="example-1519">
   <p><strong>示例 #2 Adjusting the result pointer when iterating</strong></p>
   <div class="example-contents"><p>
    This function can be useful when iterating over the result set to impose
    a custom order or rewind the result set when iterating multiple times.
   </p></div>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br />mysqli_report</span><span style="color: #007700">(</span><span style="color: #0000BB">MYSQLI_REPORT_ERROR&nbsp;</span><span style="color: #007700">|&nbsp;</span><span style="color: #0000BB">MYSQLI_REPORT_STRICT</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$mysqli&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">mysqli</span><span style="color: #007700">(</span><span style="color: #DD0000">"localhost"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"my_user"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"my_password"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"world"</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$query&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">"SELECT&nbsp;Name,&nbsp;CountryCode&nbsp;FROM&nbsp;City&nbsp;ORDER&nbsp;BY&nbsp;Name&nbsp;LIMIT&nbsp;15,4"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$result&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$mysqli</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">query</span><span style="color: #007700">(</span><span style="color: #0000BB">$query</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/*&nbsp;Iterate&nbsp;the&nbsp;result&nbsp;set&nbsp;in&nbsp;reverse&nbsp;order&nbsp;*/<br /></span><span style="color: #007700">for&nbsp;(</span><span style="color: #0000BB">$row_no&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$result</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">num_rows&nbsp;</span><span style="color: #007700">-&nbsp;</span><span style="color: #0000BB">1</span><span style="color: #007700">;&nbsp;</span><span style="color: #0000BB">$row_no&nbsp;</span><span style="color: #007700">&gt;=&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">;&nbsp;</span><span style="color: #0000BB">$row_no</span><span style="color: #007700">--)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$result</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">data_seek</span><span style="color: #007700">(</span><span style="color: #0000BB">$row_no</span><span style="color: #007700">);<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">/*&nbsp;Fetch&nbsp;single&nbsp;row&nbsp;*/<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$row&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$result</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">fetch_row</span><span style="color: #007700">();<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"City:&nbsp;%s&nbsp;&nbsp;Countrycode:&nbsp;%s\n"</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">],&nbsp;</span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #0000BB">1</span><span style="color: #007700">]);<br />}<br /><br /></span><span style="color: #FF8000">/*&nbsp;Reset&nbsp;pointer&nbsp;to&nbsp;the&nbsp;beginning&nbsp;of&nbsp;the&nbsp;result&nbsp;set&nbsp;*/<br /></span><span style="color: #0000BB">$result</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">data_seek</span><span style="color: #007700">(</span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /><br />print&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">/*&nbsp;Iterate&nbsp;the&nbsp;same&nbsp;result&nbsp;set&nbsp;again&nbsp;*/<br /></span><span style="color: #007700">while&nbsp;(</span><span style="color: #0000BB">$row&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$result</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">fetch_row</span><span style="color: #007700">())&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"City:&nbsp;%s&nbsp;&nbsp;Countrycode:&nbsp;%s\n"</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">],&nbsp;</span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #0000BB">1</span><span style="color: #007700">]);<br />}</span>
</span>
</code></div>
   </div>

   <div class="example-contents"><p>以上例程会输出：</p></div>
   <div class="example-contents screen">
<div class="cdata"><pre>
City: Acmbaro  Countrycode: MEX
City: Abuja  Countrycode: NGA
City: Abu Dhabi  Countrycode: ARE
City: Abottabad  Countrycode: PAK

City: Abottabad  Countrycode: PAK
City: Abu Dhabi  Countrycode: ARE
City: Abuja  Countrycode: NGA
City: Acmbaro  Countrycode: MEX
</pre></div>
   </div>
  </div>
 </div>


 <div class="refsect1 notes" id="refsect1-mysqli-result.data-seek-notes">
  <h3 class="title">注释</h3>
  <blockquote class="note"><p><strong class="note">注意</strong>: 
   <p class="para">
    This function can only be used with buffered results attained from the
    use of the <span class="function"><a href="mysqli.store-result.html" class="function">mysqli_store_result()</a></span>,
    <span class="function"><a href="mysqli.query.html" class="function">mysqli_query()</a></span> or <span class="function"><a href="mysqli-stmt.get-result.html" class="function">mysqli_stmt_get_result()</a></span> functions.
   </p>
  </p></blockquote>
 </div>

 
 <div class="refsect1 seealso" id="refsect1-mysqli-result.data-seek-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="mysqli.store-result.html" class="function" rel="rdfs-seeAlso">mysqli_store_result()</a> - 转移上一次查询返回的结果集</span></li>
    <li class="member"><span class="function"><a href="mysqli-result.fetch-row.html" class="function" rel="rdfs-seeAlso">mysqli_fetch_row()</a> - Fetch the next row of a result set as an enumerated array</span></li>
    <li class="member"><span class="function"><a href="mysqli-result.fetch-array.html" class="function" rel="rdfs-seeAlso">mysqli_fetch_array()</a> - Fetch the next row of a result set as an associative, a numeric array, or both</span></li>
    <li class="member"><span class="function"><a href="mysqli-result.fetch-assoc.html" class="function" rel="rdfs-seeAlso">mysqli_fetch_assoc()</a> - Fetch the next row of a result set as an associative array</span></li>
    <li class="member"><span class="function"><a href="mysqli-result.fetch-object.html" class="function" rel="rdfs-seeAlso">mysqli_fetch_object()</a> - Fetch the next row of a result set as an object</span></li>
    <li class="member"><span class="function"><a href="mysqli.query.html" class="function" rel="rdfs-seeAlso">mysqli_query()</a> - 对数据库执行一次查询</span></li>
    <li class="member"><span class="function"><a href="mysqli-result.num-rows.html" class="function" rel="rdfs-seeAlso">mysqli_num_rows()</a> - Gets the number of rows in the result set</span></li>
   </ul>
  </p>
 </div>


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